Is the cost more then getting shimano sintered metallic pads locally? The idea is to try sintered metallic to see if you like them better than the organic pads you just wore out. SM pads will last 5 times longer and have a stronger initial bit at the cost of being noisy when wet. But honestly I've had Organic pads that are twice as loud as SM and SM that are dead silent so there's more to it then blaming the pads compound.